Wir haben eine Java-Anwendung und konvertieren es in Android. Wir müssen eine Bin-Datei mit dem Namen "en-sent.bin" lesen, aber in Android gibt es eine Null-Pointerexpektion. Ich habe die bin-Datei in den Ordner "Assets" des Projekts gestellt und habe mit AssetManagers durcheinander gebracht, aber nichts hat funktioniert. ModelIn und model variablse sind immer null, wodurch der sentenceDetector eine nullpointerexception zurückgibt. Ich benutze eine Apache-Satzdetektor-Bibliothek, die diese Bin-Datei benötigt, um zu funktionieren.Nullpointer Ausnahme von der Änderung von Java zu Android
Hier ist unser Original-Code (von Java-Anwendung):
SentenceModel model = null;
InputStream modelIn = null;
try {
modelIn = new FileInputStream("en-sent.bin");
model = new SentenceModel(modelIn);
}
catch (IOException e) {
e.printStackTrace();
}
finally {
if (modelIn != null) {
try {
modelIn.close();
}
catch (IOException e) {
}
}
}
//initializes sentence detector
SentenceDetectorME sentenceDetector = new SentenceDetectorME(model);
String[] sentencesTemp = sentenceDetector.sentDetect(article);
Stapelüberwachung:
08-04 10:11:09.755 10247-10247/com.gigstudios.newssummary W/System.err: java.io.FileNotFoundException: en-sent.bin: open failed: ENOENT (No such file or directory)
08-04 10:11:09.756 10247-10247/com.gigstudios.newssummary W/System.err: at libcore.io.IoBridge.open(IoBridge.java:452)
08-04 10:11:09.756 10247-10247/com.gigstudios.newssummary W/System.err: at java.io.FileInputStream.<init>(FileInputStream.java:76)
08-04 10:11:09.756 10247-10247/com.gigstudios.newssummary W/System.err: at java.io.FileInputStream.<init>(FileInputStream.java:103)
08-04 10:11:09.756 10247-10247/com.gigstudios.newssummary W/System.err: at com.gigstudios.newssummary.WordCounter.makeSentences(WordCounter.java:52)
08-04 10:11:09.756 10247-10247/com.gigstudios.newssummary W/System.err: at com.gigstudios.newssummary.Article.<init>(Article.java:19)
08-04 10:11:09.756 10247-10247/com.gigstudios.newssummary W/System.err: at com.gigstudios.newssummary.ArticleReceiver.receiveNewsArticles(ArticleReceiver.java:87)
08-04 10:11:09.756 10247-10247/com.gigstudios.newssummary W/System.err: at com.gigstudios.newssummary.ArticleReceiver.<init>(ArticleReceiver.java:37)
08-04 10:11:09.756 10247-10247/com.gigstudios.newssummary W/System.err: at com.gigstudios.newssummary.MainActivity.fetchNews(MainActivity.java:114)
08-04 10:11:09.756 10247-10247/com.gigstudios.newssummary W/System.err: at com.gigstudios.newssummary.MainActivity$1.run(MainActivity.java:52)
08-04 10:11:09.756 10247-10247/com.gigstudios.newssummary W/System.err: at android.os.Handler.handleCallback(Handler.java:746)
08-04 10:11:09.756 10247-10247/com.gigstudios.newssummary W/System.err: at android.os.Handler.dispatchMessage(Handler.java:95)
08-04 10:11:09.756 10247-10247/com.gigstudios.newssummary W/System.err: at android.os.Looper.loop(Looper.java:148)
08-04 10:11:09.756 10247-10247/com.gigstudios.newssummary W/System.err: at android.app.ActivityThread.main(ActivityThread.java:5443)
08-04 10:11:09.756 10247-10247/com.gigstudios.newssummary W/System.err: at java.lang.reflect.Method.invoke(Native Method)
08-04 10:11:09.756 10247-10247/com.gigstudios.newssummary W/System.err: at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:728)
08-04 10:11:09.756 10247-10247/com.gigstudios.newssummary W/System.err: at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:618)
08-04 10:11:09.756 10247-10247/com.gigstudios.newssummary W/System.err: Caused by: android.system.ErrnoException: open failed: ENOENT (No such file or directory)
08-04 10:11:09.756 10247-10247/com.gigstudios.newssummary W/System.err: at libcore.io.Posix.open(Native Method)
08-04 10:11:09.756 10247-10247/com.gigstudios.newssummary W/System.err: at libcore.io.BlockGuardOs.open(BlockGuardOs.java:186)
08-04 10:11:09.756 10247-10247/com.gigstudios.newssummary W/System.err: at libcore.io.IoBridge.open(IoBridge.java:438)
08-04 10:11:09.756 10247-10247/com.gigstudios.newssummary W/System.err: ... 15 more
08-04 10:11:09.757 10247-10247/com.gigstudios.newssummary D/AndroidRuntime: Shutting down VM
08-04 10:11:09.757 10247-10247/com.gigstudios.newssummary E/AndroidRuntime: FATAL EXCEPTION: main
Process: com.gigstudios.newssummary, PID: 10247
java.lang.NullPointerException: Attempt to invoke virtual method 'java.lang.String[] opennlp.tools.sentdetect.SentenceDetectorME.sentDetect(java.lang.String)' on a null object reference
at com.gigstudios.newssummary.WordCounter.makeSentences(WordCounter.java:56)
at com.gigstudios.newssummary.Article.<init>(Article.java:19)
at com.gigstudios.newssummary.ArticleReceiver.receiveNewsArticles(ArticleReceiver.java:87)
at com.gigstudios.newssummary.ArticleReceiver.<init>(ArticleReceiver.java:37)
at com.gigstudios.newssummary.MainActivity.fetchNews(MainActivity.java:114)
at com.gigstudios.newssummary.MainActivity$1.run(MainActivity.java:52)
at android.os.Handler.handleCallback(Handler.java:746)
at android.os.Handler.dispatchMessage(Handler.java:95)
at android.os.Looper.loop(Looper.java:148)
at android.app.ActivityThread.main(ActivityThread.java:5443)
at java.lang.reflect.Method.invoke(Native Method)
at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:728)
at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:618)
Mögliche Duplikat von [Datei aus Assets lesen] (http://StackOverflow.com/Questions/9544737/Read-File- from-assets) –